高压定向喷射灌浆构筑防渗板墙技术的研究

根据坝基帷幕防渗技术的要求,在高压旋喷桩和帷幕灌浆设备的基础上,研制、组装成高压喷射灌浆专用设备,研究提出了高压定向喷射灌浆构筑防渗板墙技术工艺。通过多次进行板墙、围井试验,以及在坝基砂砾层构筑防渗板墙的工程实践,证明该项技术能够构筑厚度均匀、致密连续的板墙。板体之间、板与基岩之间接触牢固,符合防渗要求。施工速度快,且比较经济合理。这项技术可用于低水头坝基砂砾层止水防渗、截潜流等工程。已取得的工艺参数,可供设计、施工因地制宜选用。

Construction of the Impervious Wall by the Directional Jet Grouting Method

According to the technical requirement of the grout curtain to prevent the leakage in the foundation of dam, the special apparatus of the jet grouting method has been studied and equipped. In this paper, the technology to construct impervious wall by the jet grouting method is presented.This wall is in contact with the bedrock securely and its thickness is evenly and densely. The working speed is faster and construct cost is less.The set of the technique can be used to construct impervious curtain in the sand and gravelly soil foundation of lowhead dam and cut off wall. The technical parameters which have been obtained can be used to design and construction under suitable conditions.